000			00319nam a2200145Ia 4500
008			220421s9999||||xx |||||||||||||| ||und||
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040			_aET
100			_aSIDDIQI , YADAV
245		0	_aTEACHING OF SCIENCE
260			_bARYA BOOK DEPOT _aNEW DELHI
300			_a187
500			_a65450
942			_cBK
999			_c71413 _d71413